Question

Which of the following reactions would ΔH = ΔE?

• 2Al(s) + 6HCl(aq) --> 2AlCl₃(aq) + 3H₂(g)

• CaCO₃(s) --> CaO(s) + CO₂(g)

• C(s) + O₂(g) --> CO₂(g)

• C₃H₄(g) + 4O₂(g) --> 3CO₂(g) + 2H₂O(l)

• Zn⁺²(aq) + 2OH^-(aq) --> Zn(OH)₂(s)

Answer 1

We know for a reaction, AH = AE & ART, where % product a only Ing = stoichiometric coefficient of product stoichiometric coefficient of reactant of I the gaseous molecules. Now, AH = AE when ang = 0. 12 Al(s) + 6HCl(aq) ~ 2 Alcz (aq) + 3 H2 & here, ang = 3-0 =3 2) Caco, (s) + a0(s) + CO2 (g) Ang = 1-0 =1 3) (s) + O2(g) - cog) Ang = 1-1-0 ri AHEAE 4) C3 H4 (8) + 1402 (g) - (3) CO₂(g) + 2 H₂O (1) Ang = 3-4-1 = -2 3) zntaa69) + 2 (0+1(aq) zn (OH), 5) =0 Ang = 0-0 AH= AE is a So, the reaction where C (s) + O2 lg) CO₂ (g)

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